A group of students painted four cans, placed 500 grams of water in each can, and measured the temperature of the water as shown
in Figure 1.They placed the cans on a sunny windowsill for two hours and then measured the temperature again (Figure 2).
•Which statement correctly describes the significance of the temperature changes shown?
A The water molecules in the white can slowed down the most.
B The water molecules in the black can had the largest increase in average kinetic energy.
C The water molecules in the blue can have a lower average potential energy than the water molecules in the white can.
D The water molecules in the yellow can are moving at half the speed of the water molecules in the blue can.
•Which statement correctly describes the significance of the temperature changes shown?
A The water molecules in the white can slowed down the most.
B The water molecules in the black can had the largest increase in average kinetic energy.
C The water molecules in the blue can have a lower average potential energy than the water molecules in the white can.
D The water molecules in the yellow can are moving at half the speed of the water molecules in the blue can.
1 answer:
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Answer:
The peak value of the electric field is 489.64 V/m
Explanation:
Given;
power of the laser, P = 1.0 mW = 1 x 10⁻³ W
Radius of the beam, R = 1.0 mm = 1 x 10⁻³ m
Area of the beam = πr² = π(1 x 10⁻³ )² = 3.142 x 10⁻⁶ m²
The average intensity of the light = P / A
The average intensity of the light = ( 1 x 10⁻³) / (3.142 x 10⁻⁶)
The average intensity of the light = 318.27 W/m²
The peak value of the electric field is given by;
Therefore, the peak value of the electric field is 489.64 V/m.
I think this is the answer hope it helps
